Originally Posted by hunterrick
I too have a Renogy solar suitcase solar panel set. I use the Zamp wiring. It is very convenient. I think Zamp purposely wires their setup opposite the usual polarity so they can put on the sticker that says you must use Zamp only. The solution is simple. The output cable from the Renogy can simply be connected to the controller in reverse polarity - you have to connect it via screw terminals out of the box anyway, then it will work normally when connected to the Zamp wiring. The Zamp connector is a standard SAE connector, same as comes with the Renogy product.
On the connector, could be, but it might also be that they did not want an end user to have an exposed pin (from a large panel) carrying 12+ volts, ready to short and cause bigger problems...
So, marketing and safety at the same time!